Jack



Feb. 2 T926.

K. H. sAuNDERs JAC'K Filed Jan. l2,

iNvENToR ATroRNaYs Patented F eb. 2, 1926.

UNITED STATES PATENT OFFICE'.

KENNETH H. SAUNDERS, 0F BRATTLEBORO, VERMONT, ASSIGNOR TO MILLERS FALLS COMPANY, OF MILLERS FALLS, MASSACHUSETTS, A vCOBFORATION OF MASSACHU- SETTS.

J ACK.

Application led January 12, 1925.

To all tolto/m, t f/iag/ concern:

Be it known that I, KENNETH H. SAUN- nnus, a citizen of the United States, residing at Brattleboro, in the county of lindham and State of Vermont, have invented certain new and useful Improvements in Jacks, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it ap aertains to make and use the same.

This invention relates to an improved type of jack.

it is an object of the invention to provide a device of the character stated which mayI have its parts normally disposed withina relatively small amount of space, but which when extended will elevate an article which is to be lifted to a comparatively great eX- tent.

A further object of the invention is that of providing` a jack particularly adapted to form a part of an automobile tool kit, and by means of which the axle or other part which is to be elevated may be lifted with an expenditure of a minimum amount of energy and a small amount of time, whereby the device is of particular value when it is necessary, for example, to change a tire having a large body such as is usually the case in connection with low pressure or so-called balloon tires.

Another object is to be predicated on the provision of an article of the nature stated which when inuse will e'liiciently support the parts which it has served to elevate and in such a manner that there will exist virtually no danger of this support being withdrawn incident to the accidental displacement of the ack.

An additional object is that of providing a jack which will efficiently perform the purposes for which it is intended, and which will also be economically and readily manufactured and assembled.

Other objects of the invention will in part be obvious and will in part appear hereinafter. i

The invention accordingly comprises the features of construction, combination of elements and arrangement of parts which will be exemplified in the construction hereinafter set forth, and the scope of the application of which will be indicated in theclaims.

For a fuller understanding of the nature Serial No. 1,815.

and objects ofthe invention reference should be had to the following detailed description taken in connection with the accompanying drawings, in which:

Fig. 1 is a top view of one type of jack embodying the improved construction of the present invention;

Fig. 2 is a. partly sectional side view thereof; and

Fig. 3 is a partly sectional front view of the same.

The particular jack in which the invention is exemplified comprises a base 5 formed with laterally-extending supports 6 at its lower end. The upper portion of this base is provided with a pair of threaded bores adjacent either side thereof, and into these bores extend a pair of lifting screws 7 and 8. The upper ends of the screws are reduced, as indicated at 9, and extend `through annular bearings 10 carried by a. vertically movable platform in the nature of a plate 11 adapted to support the operating mechanism of the jack. rlhis mechanism comprises in the present instance a pinion 12 which may be rotated by means of a bolt 13 rotatably supported by the plate 11, and which is provided with a squared head 13 extendingoutwardly therefrom so that the pinion may be operated from a position lateral with the jack.

The periphery Of the pinion 12 is beveled, and its teeth are adapted to mesh with the teeth of a horizontal beveled gear 14, which encircles a spur gear 15 and is lockingly supported thereon by any suitable means such as screws 16. The gear 15 is in turn rotatably supported on the plate 11 in any desired manner, as by ball bearings 16. Meshing with the gear 15, in the present construction, is a pair of spur gears 17 and 18, which are rigidly secured to the reduced portions 9 of the. screws 7 and 8, respectively. The gear 15 has a screw-threaded bore 19, the threads of which are adapted to cooperate with the threads of an upper lifting screw 20, and a knurled lifting` head 21 is associated with the upper end of this screw, so that the article to be. lifted may be securely supported. In the present instance the threads of the screw 2O are interrupted by a lreyway 22, which extends substantially throughout the length of the screw, and a cooperating key 23 forms a part of a strap 24 which is rigidly secured-'to the plate 11. .The base 5, moreover', is so--constructed as to present an unobstructed path, such as the bore indicated at 25,.withi.n which the screw 2O may be telescoped. y

'The mode of operation of the particular device described above will now be apparent. The jack will be inserted under the article to be lifted and the pinion'l), rotated byany desired expedient. The rotation of the pinion will resultin the rotation yof thethorizontal bevelethgea'r 14: and a Correspending,- movement ot the central spur gear; 15. Thus, due to the fact that the screwQO is prevented r'from rotating, the Ilatter 'willl be moved in a vertical 'plane with respect tothe platform. At the same time the gears 17,518, and, consequently, the screws V7, S,willbe turned, which will result in thel platform being vertically .moved with respect tothe casing.

Thus, a double lfting movement will be transmitted to' thev article supported on the hea-'d' 21,=part of this movement'being imparted tothe screwv 20 by the upward movement' of the supporting` and liftingscrews 7 Vandv 8, and the otherpart of thefmovement resultingv from the upward Amovement of the screw 20"with1respect'to the gear 15 and the plate r11. It will be observed thatby employing' the two lifting screws 7 and rS on opposite sides of the screw Q0, the particular jack exemplified is exceedingly A sturdy and `trives a Vn'iaximum of support to an article held thereby, and that by thev particular arrangement of gears there is ob- 'tained ajael which is exceedingly eilicient in operation andwhich may beassembled with the' -utmost ease.

Itwill` also be seen that, due to the'fact that the lifting screws are inthe present instance arranged in a row, which extends at 4right angles to the toot portions of the base,

'an accidental displacement of the jack in Aone direction will 'be prevented by these 4latter operations, while a displacement in another direction will be prevented by the arrangement of the lifting'` screws.

`Thus the objects of this inventionhave been accomplished, and since certain changes may bemade in the above construction, and diti'erent embodiments of t-he invention could be made without departing'from the scope ,tlieieot, itisintended that allniatter conftaine'd in the above description or shownin the accompanyingdrawings shall be interpreted-as illustrative and not in va limiting ying sense.

It is also to' be understood that the following;- claimszare intended tocover all ofi the gener-ic and specilicfeatures yofthe invention herein described, andy all statements ot the'scope of the invention which as a matter of language might-be said totali therebetween. f

Having described my invention, what I claimasynew and ydesire to secure by Letters Patent is:

1. In a ack, in combination, three screws, means for mounting' the same, and a plu rality of intermeshingr gears operativelyconnected one with each kot' said screws, said gears being;f adapted to simultaneously operate all o't said screws to impart corerspondinfr-*movement'to two ot the same and a movement to the third screw dissimilar to the movement imparted to the iirst two screws, certain `of said gears being iixed against' movement with respect to the screws with which' they arefassociated.

`2. 4.In a jack, incombination, a plurality of liftingfscrc'ws arranged beside one another` and anumber'of intermeshing gears, one ot said gears beine' tixcdly associated with one of said screws, `another of lsaid gear-slicing' operatively connected with.and rotatable -w-ith'respect to, a second of saidscrews.

3. In a jack, in combination, a plurality tit-lifting screws .arranged beside onev another, land means for vsin-lultaneously operating' the same, said means including a able screw and a rotatable screw arranged -sideby side, 'a-gear-operatively connected with, and rotatable with respect to, said .Firstnamed screw, and a second gear cooperating with said first-named. ,Q'ear `and iixedly con Vnectedwithsaid second screw.

p 5. In al jack, in combi-nation, a plurality oi lifting screws mounted for simultaneous. rotation, another screw mounted for axial ymovement, and `'means -for actua-ting` said screws.

6. In a jack, in combination, 'a liftingvscrew, a. g'earfhaving' a threadedconnection therewith, a secondfliftingq screw arranged to one-side of said'irstscrew ard connected therewith, andmeans inclu-dingsaid. gear to operate said screws.

\7. In `a jack, in combination, a projectable -member, a second projectable member operatively connected with the aforesaid member ,and to one side of the same and means for operatingsaid members.

#8. In. a jack, in combination, a non-rotatablemember, apair of lifting 4screws -ex-v tending' from opposite sides of said member, one `ofsaid screws being rotatable with re` spect@ t-othe same, theft other kof said screws being adapted to be moved in a solely. axial direction, 4and means for .operating said screws-' 9.In ajaclcin combination, a train oi 2gears, apair of lifting screws arranged beside one another, one of said'screws having a threaded Aconnection.with one of the gears et' said? tra-in, another ot'. saidscrews being xedly secured to a second of said gears,

means for operatingY said gears, and a support for said second screw having' a threaded opening' for engagement therewith.

10. lin a jack, in combination, a plurality of projectable members, another projectable member support-ed between the aforesaid members, and means for simultaneously operating said members, said means including' a plurality of intermeshinp,` gears, one of said gears being' fixedly connected with one of said members, another of said gears being' rotatably associated with a second of sai-d members.

1i. ln a jack, in combination, screw mounted for rotation, a screw mounted solely for axial movement, and means to cause simultaneous positive and relative movement of said screws in a given direction.

12. In a. jack. in combination, a plurality of screws, the threads of which are pitched. in the same general* direction, and means to cause simultaneous positive and relatiye movement of said screws in a ,egiven direction, saidmeans comprising a plurality of intermeshing;- gears operatively connected to said screws, one of said `gears being,v fixed with respect to the screw with which it is connected.

13. A double lift jack, comprising` an axially movable upper lifting` screw, a plurality of rotatable lifting screws adapted to support the aforesaid screw and means for operating said screws.

le?. ln a jack, in con'ibination, a gear train, a screw threadedly connected to one of the ,gears of said train, a non-rotatable member, and a screw rigidly secured to another of said gears, said latter gear meshing with the first-mentioned gear, and said latter screw being;` threadedly connected with said non-rotatable member.

i5. ln a `iaek, in combination, a pair of intermeshing gears, means to rotate said gears, a crew threaded tl'irough the interior of one of the gears, means to pre-vent the rotation of the screw, a stationary member, and a screw rigidly secured to the other of said ,Q'ears and threaded into said stationary member.,

1G. ln a jack, in combination, a pinion, a gear meshing therewith, a spur gear concentric with the aforesaid gear and rotatable therewith, a second spur gear meshingv with the aforesaid spur gear, and a lifting screw operatively connected to each of said spur gears.

l?. ln a jack, in combination, a pair of screws, means for mounting the same beside one another, a pair of intermeshing gears operatiif'ely connected one with each of said screws, and means for operating said gears to turn and project one of said screws and to more the second vof the same solely in an axial direction. Y

18. ln a jack, in combination, a plurality of intermeshing gears, a support therefor, grear-operaing mechanism carried by said support, a screw threadedly connected to one of said gears, a keyway formed in said screw, key carried by said support and extending into said lreyway, a base, and a further screw 'arranged beside said lirstr-named screw and threaded into said base, said further screw being;l rotated by another of said gears.

ln testimony whereof l affix my signature.

KENNETH H. SAUNDEBS. 

